58 lines
2.1 KiB
Markdown
58 lines
2.1 KiB
Markdown
---
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id: docs-pg-identifier-truncation-note
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name: Document the pg identifier-truncation collision in the release text (review 004 item 13)
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status: pending
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depends_on: []
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scope: single
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risk: trivial
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impact: isolated
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level: implementation
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tags: [review-004-fixes, postgres-engine, docs]
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---
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## Description
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The pg identifier-truncation cross-channel collision, per
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`docs/reviews/004-pre-release-general-review.md` §"Findings recorded,
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not fixed" item 13: `LISTEN`/`UNLISTEN` interpolate the channel as a
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quoted identifier (truncated at 63 bytes server-side) while
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`pg_notify` carries it as a parameter — two distinct names sharing a
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63-byte prefix can silently collapse into one wake channel. Names are
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unbounded by the validation contract (the no-cap "length-independence"
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verdict is deliberate — do not change it; the honest cheap fix is the
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doc note the review prescribed).
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Land the note in `deployment.md` (the pg rows / wherever the matrix
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discusses naming or limits) and in `engine-postgres.md` if it has a
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wake-channel section. The note states the mechanism (63-byte
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identifier truncation; the `pg_notify` payload path unaffected) and
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the mitigation (keep mechanism names under the PG identifier limit).
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The deployment matrix is stable release text — a dated amendment
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annotation per the family's convention.
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## Acceptance Criteria
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- [ ] `deployment.md` carries the truncation-collision note with a
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dated annotation (mechanism + mitigation, honestly worded)
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- [ ] `engine-postgres.md` carries it too if a wake-channel section
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exists there (or the absence recorded in Notes)
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- [ ] The validation contract's no-cap verdict untouched
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- [ ] Doc gate green
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## References
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- docs/reviews/004-pre-release-general-review.md §"Findings recorded,
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not fixed" item 13 (the finding, the "fold into whichever doc pass
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runs next" disposition this task discharges)
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- docs/architecture/deployment.md, engine-postgres.md (the landing
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sites)
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- alkstore-postgres/src/forwarder.rs (the LISTEN/UNLISTEN
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interpolation sites, for the note's accuracy)
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## Notes
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> To be filled by implementation agent
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## Summary
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> To be filled on completion |